Honing



Jan. 27, 1953 T. A. OLSON 2,626,486

HONING Filed Jan. 2, 1947 Uvvnvrom:

HIS ATTORNEY Patented Jan. 27, 1953 HONING Theodore A. Olson, Pompton Plains, N. J assi'gnor to General Motors Corporation,

Detroit, Mich.,

a. corporation of Delaware Application January 2, 1947, Serial No. 719,886

7 Claims. 1

This invention relates to honing and comprises all the features of novelty herein disclosed. An object of the invention is to provide an improved method of honing, as by use of a hone which always starts the honing with a ridge or high spot at high unit pressure and ends with an area of contact at lower unit pressure. Another object is to provide improved apparatus for effecting a honing operation with great efiiciency, as by indexing a honing wheel after an area has worn into it and so always presenting a new high spot or ridge to start each new honing operation. To these ends and also to improve generally upon honing methods and apparatus, the invention consists in the various methods hereinafter described and claimed. In its broader aspects, the invention is not necessarily limited to the construction selected for illustrative purposes in the accompanying drawings in which:

Fig. 1 is a front view of a portion of the apparatus with some parts in section;

Fig. 2 is a plan view of some of the elements of Fig. 1;

Fig. 3 is a sectional view of the mechanism for reciprocating the hone;

Fig. 4 is a side View of the apparatus to smaller scale;

Fig. 5 is a diagrammatic plan view of the work supporting and rotating means;

Fig. 6 is a plan view of a pawl-carrying arm.

In this apparatus, a honing wheel or disc is rapidly reciprocated without any rotation against a rotatably driven work piece and, at the conclusion of the honing operation, is withdrawn from the work and ratchet mechanism prior to advance int honing relation to a new work piece. The wheel initially has a line contact with each work piece for rapid honing and acquires a gradually increasing area of contact as its breaks down and conforms to the work surface. Thus the pressure per unit'- of area is higher to begin with and decreases and becomes a glazed area which, though suitable for finishing, would be unsuitable to begin operation on a new work piece. The indexing movement is less than the angular extent of the glazed area so that the wheel presents a line of contact with each new Work piece for rapid initial honing. The wheel acquires a polygonal appearance although the sides are not fiat (unless the work is flat) but are curved when the work is circular. In any case a new high spot or ridge becomes available to begin honing on each new work piece.

In the drawings, a support 2 supports a cylinder 4 having a piston rod 6 which is provided with an indexed circumferentially by' overhanging arm 8 secured to the forked upper end of a slide or carrier it) which is guided in bearings in the support 2. The slide or support carries the honing mechanism and is given one reciprocation at each cycle, as to bring the hone into working relation with the work and to remove it therefrom. Reciprocating within the slide or carrier H is a honing shaft or plunger l2 which is connected by a link Hi and a bushing L6 to the eccentric portion of a rotating shaft H3. The shaft is journalled by bushings in the forked upper end of the slide or carrier Ii! and is rapidly driven by a belt pulley 25), thus giving the honing disc or wheel H a rapid reciprocation.

Removably secured to the lower end of the shaft or plunger H. by a set screw (or integral with it if desired) is a cupped member 25 having a peripheral flange 28 on which a ratchet ring as is supported by its internal flange 32. A felt sealing ring 33 seals the joint. The ratchet ring has a downwardly projecting annular rib 34 which is very slightly thicker than the flange 28. Fastened to the ratchet ring by dowel pins 36 and screws 38 is an outwardly projecting flange 49 on an adapter or wheel holder 42 to which the honing wheel H is clamped by a screw. The holder 42 is journalled for circumferential indexing on a bushing carried by a cylindrical projection M of the member 2%. To prevent undesired turning, brake shoes it are urged against the member 26 by coil springs is housed in the holder 42.

A. ring 5!! having an arm 52 is journalled for oscillation around the annular rib 34, the ring being slightly thinner than the rib for running clearance while supported on the flange 4D. The arm 52 carries a pivoted pawl 54 urged by a spring 56 against the ratchet ring, a stop pin it limiting pivotal movement. The pawl-carrying arm 52 is urged by a coil spring at against an inclined cam 52 on a bent plate Eli attached to the support 2. The spring 69 is attached to a post on arm 52 and to a bent arm 66 having an arcuate portion 68 attached to the member 26, the arm 56 having an adjustable stop screw 10 to limit movement of the pawl carrying arm in one direction. The arm is urged in one direction by the spring and is moved in the opposite direction when it rides up the cam.

Any suitable means (such as shown in detail in Hutchinson, Serial No. 570,110 Patent 2,433,455) is provided for supporting and rotating the work ring W. Hardened blades 12 engage the bottom edge of the work, a pair of driven rollers 14 engage the periphery, and a pressure roller 16 urges the work against the driven rollers. Any suitable means is used to cause relative feeding movement between the honing wheel and the work, as by feeding the wheel radially of the work in the direction of the arrow in Fig. 5. The honing wheel will first engage the work with line contact and then will break down into an increasing area 80 conforming to the work. When the entire honing mechanism is lifted from the work by action of the cylinder 4, the arm 52 engages the cam and causes the honing wheel to be indexed by a small amount which is less than the angular extent of a worn face 80. Hence, in the subsequent descent of the honing mechanism one of the ridges 18 is in position for line contact with the work at a high unit pressure which gradually decreases. As the operation is repeated again and again, the wheel acquires a polygonal appearance and so long as a new work surface is placed in the same location as the.

first work surface, a ridge will always be avail-.

able for the initial line contact and the honing cannot begin with an area of contact.

I claim:

1. In apparatus of the character indicated, a reciprocating plunger, a wheel holder mounted for circumferential indexing. movement with respect to the plunger, a honing wheel secured to the holder, ratchet mechanism supported by the plunger, a shiftable carrier for the foregoing parts, a support for guiding the carrier, a cam on the support, and means for shifting the carrier to cause the cam to operate the ratchet mechanism.

2. In apparatus of the character indicated, a reciprocating plunger, a wheel holder mounted on the plunger for circumferential indexing movement with respect to the plunger, a honing wheel secured to the holder, means for reciprocating the plunger to carry the honing wheel along a work surface, means for moving the Wheel out of engagement with the work surface, mechanism for indexing the wheel a distance less than the angular extent of the area worn on the wheel, and means for moving the wheel into engagement with a work surface at the same location as the first.

3. In apparatus of the character indicated, a reciprocating plunger, a wheel holder mounted for indexing movement with respect to the plunger, a honing wheel secured to the holder, a ratchet secured to the holder, an arm rockable with respect to the holder, a pawl onthe arm and engaging the ratchet, a shiftabl'e carrier for all of the foregoing parts, a support for guiding the carrier, a cam. on: the support, and means for shifting the carrier to" cause the arm to react with the cam and index the wheel.

4. In apparatus of the character indicated, a reciprocating plunger, a wheel holder reciprocating with the plunger "and mounted for indexing movement with respect to the plunger, a honing 4 wheel secured to the holder, means for preventing rotation of the wheel while reciprocating along a work surface, means for separating the wheel and the work surface, and means for indexing the wheel and its holder while the wheel and work surface are separated.

5. In apparatus of the character indicated, a support, a carrier guided by the support, means for sliding the carrier, a plunger guided by the carrier, means for reciprocating the plunger, a honing wheel mounted on the plunger, a ratchet wheel having connection with the wheel, a pawl engaging the ratchet wheel, a pawl-carrying member journalled for turning movement with respect to the plunger, a cam fixed to the support, and means for sliding the carrier with respect to the cam to cause the pawl carrying arm to react on the cam to index the honing wheel with respect to the plunger.

6. In apparatus of the character indicated, a reciprocating member, a hone holder journalled on the reciprocating member for circumferential indexing movement, a honing member secured to the holder, a carrier to guide the reciprocating member, a support for guiding the carrier, means for shifting the carrier with respect to the support to carry the honing member into and out of operative relation to a Work piece, a cam secured to the support, an arm journalled for angular movement on the reciprocating member adjacent to the hone holder, a one-way turning connection between the arm and the hone holder, and the cam being mounted in the path of the arm to turn the latter as the carrier is given its shifting movement.

7. In apparatus of the character indicated, a reciprocating member, a hone holder journalled on the reciprocating member for circumferential indexing movement, a honing member secured to the holder, a carrier to guide the reciprocating member in its reciprocation, a support for guiding the carrier in the direction of said reciprocation, means for shifting the carrier with respect to the support to carry the honing member into and out of operative relation to a work piece, and means controlled by said shifting movement to cause the hone holder to index circumferentially with respect to the reciprocating member.

THEODORE A. OLSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,106,217 Johnson Jan. 25, 1938 2,142,020 Dunbar et a1 Dec. 27, 1933 2,195,060 Wallace et a1 Mar. 26, 1940 2,239,091 Flygare Apr. 22, 1941 2,356,272 Reynolds et al Aug. 22, 1944 

